Geokge de laval



(No Model.)

G. DE LAVAL.

VALVE MECHANISM FOR STEAM PUMPS.

No. 604,475. Patented May 24, 1898.

II G

- endwise motion in cases Where the steam or i the valve, and to this valve-moving piston a a casting bolted to the heads or ends of the UNITED STATES GEORGE DE LAVAL, OF CAMBRIDGE,

PATENT .rFIcE,

MASSACHUSETTS, ASSIGNOR TO THE GEO. F. BLAKE MANUFACTURING COMPANY, OF NEW YORK, N. Y.

VALVE MECHANISM FOR STEAM-PUMPS.

SPECIFICATION forming part of Letters Iatent 0. 604,47 5, dated May 24, 1898.

Application filed August 2, 1397.

To all whmn it nea concern:

Be it known that I, GEORGE DE LA'VAL, a citizen of the United States, residing at East Cambridge, in the county of Sufiolk and State of Massachusetts, have invented an Improvement in Valve Mechanism forSteam-Pumps, of which the following is a specification.

In Letters Patent No. 428,449, granted May 20, 1890, to William H. Blake, an automatic valve-motion is represented for steam-engines especially available'for direct-acting pumping-engines, and the valve is moved by a piston which is cylindrical and slides endwise in the valve-chest and gives motion to partial revolution is givento bring intoac tion ports that allow the steam to give end motion to the valve-moving piston in either one direction or the other. With a valvemoving piston of this character a valve-rod has in some instances been used extending axially from the valve-moving piston and acted upon bya rocker mechanism and short arm that give the necessary turning motion; but this has not always been *foundreliablei and easily adjusted. i

The present invention is for giving to the rod of the valve-moving piston a partial turning motion and also for giving to such rod and the valve-moving piston a positive other pressure fails to give the necessary mo-. tion to the valve; and the present inventionrelates to the peculiar mechanism hereinafter described and claimed. a

In the drawings, Figure 1 is a side eleva tion representing the present improvement and portions of the ends of the cylinders, Fig. 2 is a cross-section at the line x m, and Fig. 3 is a detached View of the tappet-rod and arm connecting with the valve-rod.

The center piece A is usually in the form of steam-cylinder O and to the pump-cylinder P. This center piece may be of any desired character, and upon it a triangular frame B is firmly bolted at its base, and at the upper part of this frame the pivot c carries the bent lever C, and upon the piston-rod F is a twopart head-piece E, clamped by screw-bolts,

and the link D is pivoted at one end to the Serial No. 646,753. [No model.)

lower end of the bent lever C and at the other end to the head-piece E, so that the bent lever C swings upon its pivot c as the pistonrod is reciprocated by the piston.

The valve-rod Gis connected at one end to the valve-moving or chest piston H, so that such piston H and valve-rod reciprocate together, and the chest-piston receives a turning movement through the valve-rod, as hereinafter described, and inthis turning movement the pressureis admitted to act through ports to giveend motionto the chest-piston and to the valve, and as'these parts are substan tially similar to those that have been patented, as aforesaid, it is unnecessary to give a detailed description of the construction and operation of such parts.

Upon the valve-rod G an arm I is clamped and projects at one side, and the tappet-rod K has a, ball at its lower end, received into a socket atthe end of the arm I, and this rod K is valve-rod. tappet N, so that the tappet may be moved up and down upon the rod K, and the stud n and nut form a pivotal connection forthe valve-rod tappet N to the short arm of thenbent lever C.

It will now be understood that as the bent lever C is swung upon its pivot c by the movement of the pistons and piston-rod, as aforesaid, the short arm of the bent lever C moves the tappet N up and down upon the tappetrod K and through the ball-joint and clamparm I the valve-rod G receives a turning motion, which is communicated to the chest-piston for admitting steam to act at one end or the other and give motion to such chest-piston and to the valve of the engine, and in so doing the valve-rod G also receives an end motion, which is unobstructed inconsequence of the ball-joint of the tappet-rod turning in the arm I and the valve-rod tappet N turning upon its stud n, and according to the position of the tappets 7c and Z, so the chest-piston will receive a turning motion sooner or later in the stroke of the engine-piston, and thereby the valve will be moved at the proper time to admit steam for cushioning the piston and for giving a turning movement to the same, as usual in direct-acting steam-engines.

In order to guard against the possibility of the chest-piston not being moved by the action of the pressure and thereby permitting the piston to strike against the cylinder-head, I provide around the valve-rod G a sliding tappet R, having a stud r passing through a slot in the bent lever C, such stud being provided With a nut to retain it in position, and upon the valve-rod is a clamp-collar L, and the positions of this clamp-collar L and the clamp-arm I upon the rod G are such that the sliding tappet R Will engage either I or L in case the chest-piston and valve are not fully moved, and in so doing insure the proper end movement to the valve-rod and the parts therewith connected.

By the construction hereinbefore set forth the chest-piston is reliably moved and the parts can be adjusted With ease and accuracy even While the engine is running and the engine-valve ispositively moved even in cases Where the parts may have become rusty, obstructed, or difficult to move.

I claim as my invention 1. The combination With the valve-rod and chest-piston or valve-moving piston and piston-rod, of a head upon the piston-rod, a bent lever and link connection between the same and the head on the piston-rod, an arm upon the piston-rod, a tappet-rod and universaljoint connection between the same and the arm. on the valve-rod, and adjustable tappets upon said rod acted upon by the short arm of the bent lever, substantially as set forth.

2. The combination with the engine and valve-moving piston and its rod, of a head and means for clamping the same to the piston-rod of the engine, a stationary frame and pivot, a bent lever supported by the pivot and a connection between the lower end of the bent lever and the head on the pistonrod, an arm extending out from the valverod, a tappet-rod and ball connection to the arm, adjustable tappets on the rod and a tappet surrounding and sliding upon the tappctrod and a pivotal connection between the same and the short end of the bent lever, substantially as set forth.

- 3. The combination with the engine and valve-moving piston and its rod, of a head and means for clamping the same to the piston-rod of the engine, a stationary frame and pivot, a bent lever supported by the pivot and a connection between the lower end of the bent lever and the head on the pistonrod, an arm extending out from the valverod, a tappet-rod and ball connection to the arm, adjustable tappets on the rod and atappet surrounding and sliding upon the tappetrod and a pivotal connection between the same and the short end of the bent lever, a tappet surrounding and sliding freely on the valve-rod and having a stud projecting into a slot in the bent lever, and a collar upon the valve-rod for insuring the movement of the valve by the direct action of the bent lever and connection to the piston-rod, substantially as set forth.

4. The combination with the engine and its valve-moving piston, of a two-part head clamped to the piston-rod, a stationary triangular frame and a pivot carried thereby, a bent lever upon the pivot, a link pivoted at one end to the lower end of the bent lever and at the other end to the two-part head on the piston rod, a rod extending from the valve-moving piston and an arm upon the same, a t-appet-rod and ball connection to the arm, adjustable tappets on the rod, a tappet surrounding and sliding freely upon the rod and a pivotal connection for the same to the short end of the bent lever, a tappet surrounding the valve-rod and a stud thereon extending into a slot in the bent lever, and an adjustable collar upon the valve rod against Which and the arm, the sliding tappet is caused to act by the swinging movement of the bent lever, if the valve-moving piston and valve are not moved by the pressure, substantially as set forth.

Signed by me this 27th day of July, 1897.

GEORGE DE LAVAL. \Vi tnesses:

JOHN J. FINLEY, ALLEN S. ORooKER. 

